Why compile Python code?

by

It’s compiled to bytecode which can be used much, much, much faster.

The reason some files aren’t compiled is that the main script, which you invoke with python main.py is recompiled every time you run the script. All imported scripts will be compiled and stored on the disk.

Important addition by Ben Blank:

It’s worth noting that while running a
compiled script has a faster startup
time (as it doesn’t need to be
compiled), it doesn’t run any
faster.

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